#include <iostream>
#include <vector>
typedef long long ll;
int main() {
std::ios::sync_with_stdio(false);
std::cin.tie(nullptr);
ll n;
std::vector<ll> d;
std::cin >> n;
d.resize(n-1);
for (ll i = 0; i < n-1; i++) {
std::cin >> d[i];
}
std::vector<ll> pref(n);
for (ll i = 0; i < n-1; i++) {
pref[i+1] = pref[i] + d[i];
}
ll maxx = -1;
for (ll i = 0; i < n; i++) {
if (pref[i] > maxx) {
maxx = pref[i];
}
}
ll minn = 1'000'000'000;
for (ll i = 0; i < n; i++) {
if (pref[i] < minn) {
minn = pref[i];
}
}
if (maxx - minn != n-1) {
std::cout << -1;
return 0;
}
for (ll i = 0; i < n; i++) {
std::cout << pref[i] + std::abs(minn) + 1 << " ";
}
}
